Right click drag box around items on ground - picks up all in some sequence when RMB is released (like to inventory) 'till inventory is full, or for more than one item type in box...
Brings up an item display box for items in dragged square and you can select items to be collected...
or something like that, iso having to pick up items by carefully right clicking one by one? especially arrows, straw, plant fibers, meat & intestines